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신정규(J.K.Shin),이정욱(J.W. Yi),이해주(H.J. Lee),박경진(G.J. Park) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
A rotor bar in an induction motor for electric railway is studied from a design viewpoint. The design<br/> process is divided into two stages; conceptual design and detailed design. In conceptual design, overall<br/> configuration is determined. A computer program is developed for the conceptual design. Various formulae<br/> are developed for analysis. They are derived from elementary and advanced elasticity. Design equations are<br/> made from the formulae and they are programmed with Graphic User Interface (GUI) for user convenience.<br/> Structural optimization is adopted for the detailed design. Finite element method is used for analysis. A design<br/> problem is defined to minimize mass or maximum stress while constraints are satisfied.
[안전/타이어운동특성부문] 승객거동해석을 이용한 후방 추돌시 목 상해를 줄이기 위한 좌석설계
신문균(K.Park),박기종(M.K.Shin),박경진(G.J.Park) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Occupant injury in rear end impact is rapidly becoming one of the most aggravating traffic safety problems with high human suffering and societal costs. Although rear end impact occurs at relatively low speed, it may cause permanent disability due to neck injuries resulting from an abrupt moment, shear force, and tension/ compression force at the occipital condyles. The analysis is performed for a combined occupant-seat model response, using the SAFE(Safety Analysis For occupant crash Environment) computer program. The computational results are verified by those from sled tests. A parameter study is conducted for many physical and mechanical properties. Seat design has been performed based on the design of experiment process with respect to five parameters seatback upholstery stiffness, torsional stiffness of the seatback, headrest upholstery stiffness, the clearance between occupant' s head and the headrest, and friction coefficient of the seatback
등가정하중을 이용한 구조최적설계 방법을 이용한 비선형 거동 구조물의 최적설계
박기종(K. J. Park),박경진(G. J. Park) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
Nonlinear Response Optimization using Equivalent Static Loads (NROESL) method/algorithm is proposed to perform optimization of non-linear response structures. It is more expensive to carry out nonlinear response optimization than linear response optimization. The conventional method spends most of the total design time on nonlinear analysis. Thus, the NROESL algorithm makes the equivalent static load cases for each response and repeatedly performs linear response optimization and uses them as multiple loading conditions. The equivalent static loads are defined as the loads in the linear analysis, which generates the same response field as those in non-linear analysis. The algorithm is validated for the convergence and the optimality. The function satisfies the descent condition at each cycle and the NROESL algorithm converges. It is mathematically validated that the solution of the algorithm satisfies the Karush-Kuhn-Tucker necessary condition of the original nonlinear response optimization problem. The NROESL algorithm is applied to two structural problems. Conventional optimization with sensitivity analysis using the finite difference method is also applied to the same examples. The results of the optimizations are compared. The proposed method is very efficient and derives good solutions.
충돌모의시험시 시험결과와 해석결과에 대한 변수 조절에 관한 연구
임재문(J.M.Lim),최우석(W.S.Choi),최중원(J.W.Choi),박경진(G.J.Park),신윤재(Y.J.Shin),이재협(J.H.Lee),김규현(K.H.Kim),윤경한(K.H.Yoon) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_1
충돌모의시험을 컴퓨터 시뮬레이션하기 위하여 매개변수 (prameter)<br/> 조절과정(tuning process) 을 통하여 시험결과와 해석결과를 일치시켜 모델링을 완성시키는 절차를 확립하고자 하였다 . 매개변수로는 힘 -변형 합수의 보정계수 (scale factor)와 에어백의 질량호름을 곡선의 보정계수를 택하였다 . 매개변수 조절과정을 통하여 연구를 수행 한 결과 HIC 및 머리의 가속도곡선은 시험결과와 잘 일치하였다 . 가슴의 가속도곡선 및 대퇴부의 상해치 풍도 잘 일치시키기 위해서는 다목적합수에 기초한 최적화과정이 필요할 것으로 생각된다 .<br/>
신문균(M.K.Shin),박경진(K.J.Park),이완익(W.I.Lee),김형중(H.J.Kim),정근섭(K.S.Jung) 한국자동차공학회 1992 오토저널 Vol.14 No.2
Real automobiles have been utilized to study the occupant behaviors and the response of the structures in the crash environment. Since various parameters are involved in the automobile crashworthiness, a number of experiments must be conducted. The experiments have been contributed to increasing the cost due to the fact that the test is quite expensive. Therefore, computer simulation is adopted to reduce the number of experiments. A few computer programs have been developed specifically to solve the occupant responses in the crash environment. In this research, a software is used to study the occupant dynamic analysis. A modeling of occupant analysis is established for a passenger car and the results are verified through comparisons with real experiments. In the modeling, data are tuned very carefully so that the simulated results such as HIC (Head Injury Criterion) and acceleration of each body may approximate to the experimental results. The compared experiment is a barrier test which is carried out by frontal impact. A feedback to the design process is suggested from the result of this research.
K.W. Kim(김광우),K.J. Woo(우관제),G.J. Park(박경진) 한국철도학회 2012 한국철도학회 학술발표대회논문집 Vol.2012 No.5
The railway vehicle industry faces increasing pressure to enhance performance and safety while minimizing weight, manufacturing cost and fuel consumption. Structural optimization can be an effective method to design the structure of a railway-car body. In recent years, there have been many applications that design the structure of a vehicle body with aluminum material. The mass and stiffness of the structure can be determined by changing the shape and thickness of the webs and ribs. In this research, a design process based on structural optimization is proposed to design the rib shape of each unit and the entire thickness distribution of an aluminum railway-car body. The process for a systematic design of an car body is established to reduce the weight while sufficient strength is kept.